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CN-121993459-A - Intelligent hydraulic loading system and method for medium-speed coal mill

CN121993459ACN 121993459 ACN121993459 ACN 121993459ACN-121993459-A

Abstract

The invention discloses an intelligent hydraulic loading system and method for a medium-speed coal mill, which relate to the technical field of intelligent hydraulic loading and comprise an oil pump station, wherein a motor is arranged at the top of the oil pump station, an oil pump is assembled at the output end of the motor, the oil pump is characterized in that oil delivery pipes connected with the oil pump stations are arranged on two sides of the oil pump, guide pipes are connected on two sides of the top of the oil pump, a hydraulic cylinder is connected to one end, far away from the oil pump, of each guide pipe, a pressure relief assembly is arranged on each guide pipe, and a piston rod is connected inside each hydraulic cylinder in a sliding mode. The automatic pressure relief device realizes automatic pressure relief through a mechanical structure, does not need an additional control circuit, reduces the complexity and cost of a system, simultaneously effectively avoids the pressure relief of a traditional overflow valve, possibly causes untimely pressure relief due to pressure transfer lag when the system is stopped, has the risk of overpressure, and simultaneously causes the problems of valve core abrasion, hydraulic oil temperature rise, system energy consumption increase and the like due to long-time impact of hydraulic oil on the overflow valve, thereby further improving the reliability and service life of the system.

Inventors

  • Li Canzhi
  • Lv Xingcheng
  • MAO YISHENG
  • ZHENG YAMING
  • HONG YOUYAO
  • LIN YUEXIN
  • WANG LEI
  • XU YUANGANG
  • ZHANG NAN

Assignees

  • 广东红海湾发电有限公司
  • 广东电力发展股份有限公司
  • 西安热工研究院有限公司

Dates

Publication Date
20260508
Application Date
20260323

Claims (10)

  1. 1. The utility model provides a medium speed pulverizer intelligence hydraulic loading system, a serial communication port, including oil pump station (100), motor (110) are installed at oil pump station (100) top, motor (110) output is equipped with oil pump (120), oil pump (120) both sides are equipped with defeated oil pipe (121) that are connected with oil pump station (100), and oil pump (120) top both sides all are connected with pipe (130), the one end that oil pump (120) was kept away from to pipe (130) is connected with pneumatic cylinder (150), and install pressure release subassembly (200) on pipe (130), pneumatic cylinder (150) inside sliding connection has piston rod (160), and pneumatic cylinder (150) top is equipped with protection subassembly (300).
  2. 2. The intelligent hydraulic loading system of the medium speed coal mill according to claim 1, wherein the pressure relief assembly (200) comprises a fixed block (210) arranged on the outer wall of a group of guide pipes (130), a supporting block (220) is fixed at the top of the fixed block (210), a movable plate (230) is slidably connected to the inner wall of the supporting block (220), a square block (240) is fixed to the bottom end of the movable plate (230), a vertical pipe (250) connected with the guide pipes (130) is arranged in the square block (240), first through grooves (251) are formed in the two sides of the outer wall of the vertical pipe (250), a sleeve (260) fixed to the movable plate (230) is sleeved on the outer wall of the vertical pipe (250), second through grooves (261) are formed in the two sides of the outer wall of the sleeve (260), and ball valves (270) are rotatably connected to the lower ends of the inner walls of the vertical pipe (250).
  3. 3. The intelligent hydraulic loading system of the medium speed coal mill according to claim 2, wherein electromagnetic valves (140) for controlling the flow direction of hydraulic oil are arranged on the two groups of guide pipes (130), and an oil filter (141) arranged on the guide pipes (130) is arranged on one side of each electromagnetic valve (140).
  4. 4. The intelligent hydraulic loading system of the medium speed coal mill according to claim 2, wherein the lower end of the inner wall of the hydraulic cylinder (150) is a rodless cavity (151), the upper end of the inner wall of the hydraulic cylinder (150) is a rod cavity (152), and a first sealing ring (161) is arranged on the joint surface of the lower end of the piston rod (160) and the inner wall of the hydraulic cylinder (150).
  5. 5. The intelligent hydraulic loading system of the medium speed coal mill according to claim 4, wherein the first through groove (251) and the second through groove (261) are arranged in a vertically staggered mode, and the upper end and the lower end of the second through groove (261) are respectively provided with a second sealing ring (262) arranged on the inner wall of the sleeve (260).
  6. 6. The intelligent hydraulic loading system of a medium speed coal pulverizer as recited in claim 2, wherein the top of the piston rod (160) is connected to the mill roll and is configured to apply pressure to raw coal on an inner mill ring of the pulverizer.
  7. 7. The intelligent hydraulic loading system of the medium speed coal mill according to claim 2, wherein ventilation grooves (221) are formed in two sides of the supporting block (220), and the ventilation grooves (221) are arranged in a shape of a Chinese character 'ji'; sliding blocks (231) are fixed on two sides of the moving plate (230), and sliding grooves (232) for the sliding blocks (231) to move are formed in the inner walls of the supporting blocks (220).
  8. 8. The intelligent hydraulic loading system of the medium speed coal mill according to claim 2, wherein a cross rod (280) penetrating through the outer wall of the vertical pipe (250) is fixed at the front end of the ball valve (270), a gear (290) is fixed at the end of the cross rod (280), a rack (291) meshed with one side of the gear (290) is arranged, a linear driver (2910) is mounted at the front end of the supporting block (220), a balancing weight (2920) is mounted at the output end of the linear driver (2910), the bottom end of the balancing weight (2920) is fixed with the rack (291), and a shell (2921) fixed with the supporting block (220) is arranged outside the linear driver (2910).
  9. 9. The intelligent hydraulic loading system of a medium speed coal pulverizer according to claim 2, wherein the protection assembly (300) comprises a protection block (310) fixed at the top of the hydraulic cylinder (150), the outer wall of the protection block (310) is slidably connected with a telescopic block (320), the upper end of the outer wall of the piston rod (160) is fixed with the telescopic block (320) and penetrates through the top of the telescopic block, a cleaning circular ring (340) is sleeved at the top end of the piston rod (160), and a threaded sleeve (330) rotationally connected with the telescopic block (320) is arranged at the bottom end of the cleaning circular ring (340).
  10. 10. A medium speed coal mill intelligent hydraulic loading method, characterized in that the method is based on the medium speed coal mill intelligent hydraulic loading system according to any one of claims 1 to 9, comprising: The oil pump (120) is driven to start to work by the starting motor (110), the oil pump (120) extracts hydraulic oil from the oil pump station (100) through the oil delivery pipe (121) and conveys the hydraulic oil into the guide pipe (130), the hydraulic oil flows along the guide pipe (130), a part of the hydraulic oil enters the hydraulic cylinder (150) to push the piston rod (160) to move upwards, and raw coal on a grinding ring in the grinding roller coal mill applies pressure, so that grinding operation is realized; in the grinding process, if the pressure of hydraulic oil in the system is too high, when the pressure reaches a set value, pressure relief is realized through a pressure relief component (200) arranged on a conduit (130); When the piston rod (160) moves upwards to apply pressure to the grinding roller, the protection assembly (300) can slide upwards along with the rising of the piston rod (160), and through shielding, the extending part of the piston rod (160) can be protected, so that pulverized coal and dust can be prevented from directly falling on the lower end position of the piston rod (160), and the pulverized coal and dust can be prevented from being brought into the hydraulic cylinder (150) when the piston rod (160) is retracted into the hydraulic cylinder (150).

Description

Intelligent hydraulic loading system and method for medium-speed coal mill Technical Field The invention relates to the technical field of intelligent hydraulic loading, in particular to an intelligent hydraulic loading system and method for a medium-speed coal mill. Background The medium-speed coal mill is used for grinding coal to obtain coal powder, the grinding force of the medium-speed coal mill is generated by a hydraulic loading system, a hydraulic cylinder is used as an executive component of the hydraulic loading system, the grinding force can be applied to a grinding roller, the grinding roller applies pressure to a coal bed on a grinding disc, and the grinding disc rotates to drive the grinding roller to rotate, so that the coal powder is continuously prepared. The existing medium speed coal mill hydraulic loading system mostly adopts a traditional overflow valve to carry out pressure relief control, however, the control mode has a plurality of defects in practical application, on one hand, when the system is stopped, the overflow valve can not timely relieve pressure due to hysteresis in pressure transmission, so that the internal pressure of the system is too high, equipment is damaged, the stability and safety of the system are affected, on the other hand, hydraulic oil continuously impacts the overflow valve for a long time, a valve core is worn, the service life of the overflow valve is shortened, the problems of hydraulic oil leakage and the like are caused, and the running cost is increased. Disclosure of Invention The invention provides an intelligent hydraulic loading system and method for a medium-speed coal mill, which can effectively overcome the defects of a traditional overflow valve pressure relief mode and realize an automatic pressure relief function. In order to achieve the above purpose, the present invention adopts the following technical scheme: The utility model provides a medium speed pulverizer intelligence hydraulic loading system, includes the oil pump station, and the motor is installed at oil pump station top, and the motor output is equipped with the oil pump, and the oil pump both sides are equipped with the defeated oil pipe that is connected with the oil pump station, and oil pump top both sides all are connected with the pipe, and the one end that the oil pump was kept away from to the pipe is connected with the pneumatic cylinder, and installs pressure release subassembly on the pipe, and the inside sliding connection of pneumatic cylinder has the piston rod, and the pneumatic cylinder top is equipped with protection component. The pressure relief assembly comprises a fixed block arranged on the outer wall of a group of guide pipes, a supporting block is fixed at the top of the fixed block, a moving plate is slidably connected to the inner wall of the supporting block, a square block is fixed at the bottom end of the moving plate, a vertical pipe connected with the guide pipes is arranged in the square block, first through grooves are formed in two sides of the outer wall of the vertical pipe, a sleeve pipe fixed with the moving plate is sleeved on the outer wall of the vertical pipe, second through grooves are formed in two sides of the outer wall of the sleeve pipe, and a ball valve is rotatably connected to the lower end of the inner wall of the vertical pipe. The invention is further improved in that electromagnetic valves for controlling the flow direction of hydraulic oil are arranged on the two groups of the guide pipes, and an oil filter arranged on the guide pipes is arranged on one side of each electromagnetic valve. The invention is further improved in that the lower end of the inner wall of the hydraulic cylinder is a rodless cavity, the upper end of the inner wall of the hydraulic cylinder is a rod cavity, and a first sealing ring is arranged on the joint surface of the lower end of the piston rod and the inner wall of the hydraulic cylinder. The invention is further improved in that the first through groove and the second through groove are arranged in a vertically staggered way, and the upper end and the lower end of the second through groove are respectively provided with a second sealing ring which is arranged on the inner wall of the sleeve. The invention is further improved in that the top of the piston rod is connected to the grinding roller and is caused to exert pressure on the raw coal on the grinding ring inside the coal mill. The invention is further improved in that the two sides of the supporting block are provided with ventilation grooves which are arranged in a shape like a Chinese character 'ji'; the sliding blocks are fixed on two sides of the moving plate, and sliding grooves for the sliding blocks to move are formed in the inner walls of the supporting blocks. The invention is further improved in that a cross rod penetrating through the outer wall of the vertical pipe is fixed at the front end of the ball valve, a gear is fixed at